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Spray after fruit development (20 days after walnut stage) in apple plant refers to the application of certain chemicals or compounds to protect apples from pests, diseases, and environmental stress factors. It is a critical step in apple production management, as it helps to boost the quality and quantity of the harvest.
One of the primary objectives of the spray after fruit development (20 days after walnut stage) is to control pests and diseases that can damage apple fruit. Examples of pests that can attack apple fruit after development include aphids, codling moth, mites, and fruit flies. Pesticides, such as neonicotinoids, pyrethroids, and organophosphates, can be used to control these pests.
In addition to pests, diseases can also affect the quality and yield of apple fruit. Some of the common apple diseases include apple scab, powdery mildew, and fire blight. Fungicides such as captan, sulfur, and myclobutanil can be used to prevent and control these diseases.
Apart from pest and disease control, spray after fruit development can also involve the application of growth regulators, nutrient supplements, and anti-stress compounds. These products are aimed at improving the size, color, and shelf life of the fruit. Growth regulators, such as gibberellins, can be used to increase fruit size and improve uniformity. Nutrient supplements, such as calcium and boron, can be used to prevent fruit cracking and improve firmness. Anti-stress compounds, such as abscisic acid, can enhance the fruit’s ability to withstand environmental stress factors such as heat and drought.
It is important to note that the selection and application of chemicals for spray after fruit development in apple plants should be done carefully to minimize adverse effects on human health, the environment, and beneficial insects such as pollinators. Appropriate protective equipment should also be used when applying pesticides to minimize exposure to the applicator.
In conclusion, spray after fruit development (20 days after walnut stage) in apple plants is an essential practice in apple production management. By controlling pests and diseases, applying growth regulators, nutrient supplements, and anti-stress compounds, apple growers can achieve a high-quality, abundant harvest.